单项选择题
High-velocity fog（）.
A.is a finer，more diffuse water spray than low-velocity fog
B.requires that the water pressure be no greater than 60 psi
C.produces an effective fog pattern no more than 6 feet beyond the nozzle
D.extinguishes a fire by absorbing heat and reducing the supply of oxygen
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相关考题
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单项选择题
Halon from extinguishers used on a class B fire，should be directed（）.
A.at the top of the flames
B.at the base of the fire near the edge
C.in short quick bursts
D.toward the upwind side of the fire -
单项选择题
Halon fire extinguishers are NOT effective when used on which types of fires?（）
A.Fires in electrical equipment
B.Flammable oils and greases
C.Class A fires in ordinary combustibles
D.Materials containing their own oxygen -
单项选择题
Halon extinguishes fire primarily by（）.
A.cooling
B.smothering
C.shielding of radiant heat
D.breaking the chain reaction
